FusionDex

Concealed within Omaras's two shells grow ancient fungi that are believed to be otherwise extinct in this world. Since the fungi die if removed, the only method scientists have found to preserve this species is by breeding lots of Omaras.

A Omaras has parasitic tochukaso mushrooms growing on its back. One of the ancient and long-since-extinct Pokémon that have been regenerated from fossils by humans.